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Why do people get heartburn/acid indigestion?
When you swallow, food travels down a pipe called the esophagus and reaches a valve (lower esophageal sphincter or LES) which makes food's passage into the stomach a one-way trip. The LES responds to pressure by opening and, when the food has passed through, closing. Then the stomach, which essentially has an acid-proof lining, begins producing additional acid to digest food and kill bacteria.
However, certain foods or conditions can weaken the LES, causing the valve to open and letting the acid-laced stomach contents flow back into the esophagus. When that happens, the delicate tissues of the esophagus are literally burned by the acid. This creates the familiar, fiery sensation we call heartburn.
